The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Sep. 08, 1993
Applicant:
Inventors:
Assignee:
Kao Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03G / ;
U.S. Cl.
CPC ...
430110 ; 430109 ; 430108 ;
Abstract
The present invention is directed to a toner composition containing a polyester resin having an OHV/AV value of 1.2 or more as a major component of a binder resin wherein AV is an acid value of said polyester and OHV is a hydroxyl value thereof and hydrophobic silica having a degree of hydrophobic property of 80 or more or having a pH value of 5.5 to 8 in water-methanol solution. A toner composition of the present invention exhibits no decrease in electric charge retainability and fluidity of a toner and a visible image with good quality for a long period with no black spots occurring.